snicolai-blog
commented
3 years ago Something in Mojave changed in the past several months and I'm seeing this now as well, I didn't see it in April/May in an older Mojave.
I suspect that the default GCD priority changed (or something else around it changed priority, causing the default to get less time). I see the queue is created with default priority, not user interactive, which might help alleviate this problem. See
https://github.com/v002/v002-Camera-Live/blob/master/Camera%20Live/SyPAppDelegate.m#L136
It's an easy fix to use
https://developer.apple.com/documentation/dispatch/1453028-dispatch_queue_attr_make_with_qo
to change the QoS to user interactive.
jrucho
Hi! I used Camera Live for a few years now and I was mainly using it on my old macbook pro from 2012 on Sierra and everything was working as expected ( even with two cameras at the same time with two separate instances of the app). I just found out after upgrading that macbook pro and another macbook 12" to Mojave that the app (v11) doesn't work the same anymore. It starts and after e few seconds there is two or three seconds of lag happening every now and then. It is like a patern (10-15 seconds fluid and then a few seconds of lag). It happens with my three cameras.
Steps to reproduce the behavior:
I expected to get a clean feed like on Sierra but some of the video codecs might have changed since then. Do you know if there is a memory problem on Mojave? Does it work better in Catalina?
I used the v13 of the app and I found out that the app is more responsive and fast but the lag it higher than the v.11 for me, for the 3 cameras and the two macbooks.
ps: On Sierra and High Sierra , I could get a lag free feed on my macbook pro 2012 for hours and 15 min of lag free on my 12" macbook while recording at 720p inside Syphon Recorder.
Cheers